Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net income (loss)	$ 49,791	$ 31,408	$ (43,465)
Other comprehensive income (loss):
Foreign currency translation adjustment	4	(141)	(21)
Comprehensive income (loss)	$ 49,795	$ 31,267	$ (43,486)